I have all of the turtle shells

well i completed my feathers and i found out ...lol..

When I completed my collection of coral I saw the same piece of coral that had just been found appear on the wall behind the research lab. Was that just a coincidence, or is it always the last-needed piece of a collection that appears? I'm still waiting on one turtle shell, two feathers, and all four rare tablet pieces ...

arnie, which one is it?
i have only completed the coral and the last piece, the green one, is the one that is on the wall
that was not the last one collected

i lack one turtle shell, the next to last
one feather, the next to last and 3 pieces of tablet

Ah. Thanks, patricia57! If it wasn't the last one you collected there goes my hypothesis. It's the green one, like yours. I thought it was probably more complicated to program than need be, but it would have been cool ...

I got finshed with all MY collectoins but the turtal shell, can you help me out? Me and my familey are really concirned about finding that shell